Form I-UDA, P/N 195673 Rev 13, Page 8
Operating Sequence
1. Set thermostat at lowest setting.
2. Turn off all electric power to the appliance.
3. This appliance is equipped with an ignition device which automatically lights the
burner. Do not try to light the burner by hand. Open the access door and locate the
gas control (ON/OFF) knob on the gas valve. (See
FIGURE 17
.)
4. Turn the gas control knob clockwise to “OFF”.
5. Wait five (5) minutes to clear out any gas. Then smell for gas, including near the
floor.
If you smell gas, STOP!
and follow the steps in the
WARNINGS
printed
above or on the Operating Label on the heater. If you do not smell gas, proceed to
the next step.
6. Turn the gas control knob counterclockwise to “ON”.
7. Close the access door.
8. Turn on the electric power to the heater.
9. Set the thermostat to the desired setting.
NOTE:
If the appliance does not operate, follow the instructions “To Turn Off Gas to
Appliance” printed below (and on the Operating Label on the heater) and call your
service technician.
10. Thermostat calls for heat, energizing the venter motor.
11. Venter pressure switch closes, firing the unit.
12. Burner flame is sensed and in 30 seconds after the gas valve is energized, the
fan motor is energized.
13. If the flame is extinguished during the main burner operation, the integrated con
-
trol system closes the main valve and must be reset by interrupting power to the
control circuit. (See lighting instructions on the heater.).
TO TURN OFF GAS TO THE APPLIANCE
1) Set thermostat to lowest setting
2) If service is to be performed, turn off all electric power to the appliance.
3) Open the access door.
4) Turn the gas control knob clockwise to “OFF”. Do not force.
5) Close the access door.
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FIGURE 17 - Gas Valve
ON/OFF Control Knob
9.3 Check
installation after
startup:
Vent System Testing Procedure - Model UDAP
1. Seal any unused openings in the venting system.
2. Inspect the venting system for proper size and horizontal pitch, as required in
the National Fuel Gas Code, ANSI Z223.1 or CSA B149.1 and B149.2, Installa
-
tion Code for Gas Burning Appliances and Equipment, and the venting installa
-
tion manual. Determine that there is no blockage or restriction, leakage, corro
-
sion or other deficiencies that could cause an unsafe condition.
3. In so far as practical, close all building doors and windows and all doors
between the space where the heater is and other spaces of the building.
Turn on clothes dryers and exhaust fans, such as range hoods and bathroom
exhausts, so they shall operate at maximum speed. Do not operate a summer
exhaust fan. Close fireplace dampers.
4. Light the heater following the lighting instructions. Adjust the thermostat for
continued operation. Verify that combustion products are venting properly. After
determining that the heater vents properly, return doors, windows, exhaust
fans, and fireplace dampers to their previous conditions. If improper venting is
observed, the venting system must be corrected.
With the unit in operation, measure valve outlet gas pressure. If operated at high
altitude, adjust outlet gas pressure for altitude.
See information and instructions in Paragraph 6.1.
Turn the unit off and on, pausing two minutes between each cycle. Observe for
smooth ignition.
9. Commissioning
and Startup
(cont’d)
9. Heater Startup (cont’d)